package com.atguigu.gulimall.ware.service.impl;

import com.alibaba.fastjson.TypeReference;
import com.atguigu.common.to.mq.OrderTo;
import com.atguigu.common.to.mq.StockDetailTo;
import com.atguigu.common.to.mq.StockLockedTo;
import com.atguigu.common.utils.PageUtils;
import com.atguigu.common.utils.Query;
import com.atguigu.common.utils.R;
import com.atguigu.gulimall.ware.dao.WareSkuDao;
import com.atguigu.gulimall.ware.entity.WareOrderTaskDetailEntity;
import com.atguigu.gulimall.ware.entity.WareOrderTaskEntity;
import com.atguigu.gulimall.ware.entity.WareSkuEntity;
import com.atguigu.gulimall.ware.exception.NoStockException;
import com.atguigu.gulimall.ware.feign.OrderFeignService;
import com.atguigu.gulimall.ware.feign.ProductFeignService;
import com.atguigu.gulimall.ware.service.WareOrderTaskDetailService;
import com.atguigu.gulimall.ware.service.WareOrderTaskService;
import com.atguigu.gulimall.ware.service.WareSkuService;
import com.atguigu.gulimall.ware.vo.OrderItemVo;
import com.atguigu.gulimall.ware.vo.OrderVo;
import com.atguigu.gulimall.ware.vo.SkuHasStockVo;
import com.atguigu.gulimall.ware.vo.WareSkuLockVo;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import lombok.Data;
import org.springframework.amqp.rabbit.annotation.RabbitListener;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.util.StringUtils;

import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

@RabbitListener(queues = "stock.release.stock.queue")
@Service("wareSkuService")
public class WareSkuServiceImpl extends ServiceImpl<WareSkuDao, WareSkuEntity> implements WareSkuService {

    @Autowired
    WareSkuDao wareSkuDao;

    @Autowired
    ProductFeignService productFeignService;

    @Autowired
    RabbitTemplate rabbitTemplate;

    @Autowired
    WareOrderTaskService orderTaskService;

    @Autowired
    WareOrderTaskDetailService orderTaskDetailService;

    @Autowired
    OrderFeignService orderFeignService;


    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        QueryWrapper<WareSkuEntity> queryWrapper = new QueryWrapper<>();


        /**
         *  wareId: 123,//仓库id
         *    skuId: 123//商品id
         */
        String wareId = (String) params.get("wareId");
        if (!StringUtils.isEmpty(wareId)) {
            queryWrapper.eq("ware_id", wareId);
        }

        String skuId = (String) params.get("skuId");
        if (!StringUtils.isEmpty(skuId)) {
            queryWrapper.eq("sku_id", skuId);
        }
        IPage<WareSkuEntity> page = this.page(
                new Query<WareSkuEntity>().getPage(params),
                queryWrapper
        );

        return new PageUtils(page);
    }


    @Override
    public void addStock(Long skuId, Long wareId, Integer skuNum) {
        //1、判断如果还没有这个库存记录新增操作
        List<WareSkuEntity> entities = wareSkuDao.selectList(new QueryWrapper<WareSkuEntity>().eq("sku_id", skuId).eq("ware_id", wareId));
        if (entities == null || entities.size() == 0) {
            WareSkuEntity skuEntity = new WareSkuEntity();
            skuEntity.setSkuId(skuId);
            skuEntity.setStock(skuNum);
            skuEntity.setWareId(wareId);
            skuEntity.setStockLocked(0);
            //如果失败整个事务无需要回滚
            //无需回滚：第一种方式 自己catch异常
            //       TODO   第二种方式 还可能用什么办法让异常出现后不回滚
            try {
                R info = productFeignService.info(skuId);
                if (info.getCode() == 0) {
                    Map<String, Object> data = (Map<String, Object>) info.get("skuInfo");
                    skuEntity.setSkuName((String) data.get("skuName"));
                }
            } catch (Exception e) {

            }

            wareSkuDao.insert(skuEntity);
        } else {
            wareSkuDao.addStock(skuId, wareId, skuNum);
        }

    }

    @Override
    public List<SkuHasStockVo> getSkusHasStock(List<Long> skuIds) {

        List<SkuHasStockVo> collect = skuIds.stream().map(skuId -> {
            SkuHasStockVo vo = new SkuHasStockVo();
            //查询当前sku的总库存量
            //SELECT SUM(stock - stock_locked) FROM `wms_ware_sku` WHERE sku_id=#{skuId}
            long count = baseMapper.getSkuStock(skuId);
            vo.setSkuId(skuId);
            vo.setHasStock(count > 0 ? true : false);
            return vo;
        }).collect(Collectors.toList());
        return collect;
    }

    /**
     * (rollbackFor = NoStockException.class)
     * 默认只要是运行时异常就会回滚
     * <p>
     * 库存解锁的场景
     * 1）、下订单成功，订单过期没有支付被系统自动取消，被用户手动取消。都要解锁库存
     * <p>
     * <p>
     * 2）、下订单成功，库存锁定成功，接下来的业务调用失败，导致订单回滚。
     * 之前锁定的库存就要自动解锁
     *
     * @param vo
     * @return
     */
    //@GlobalTransactional
    @Transactional
    @Override
    public boolean orderLockStock(WareSkuLockVo vo) {

        /**
         * 保存库存工作单的详情
         * 追溯（人工回滚也方便）
         */
        WareOrderTaskEntity taskEntity = new WareOrderTaskEntity();
        taskEntity.setOrderSn(vo.getOrderSn());
        orderTaskService.save(taskEntity);


        //1、按照下单的收货地址，找到一个就近仓库，锁定库存(暂时不做)
        //找到每个商品在哪个仓库都有库存
        List<OrderItemVo> locks = vo.getLocks();
        List<SkuWareHasStock> collect = locks.stream().map(item -> {
            SkuWareHasStock stock = new SkuWareHasStock();
            Long skuId = item.getSkuId();
            stock.setSkuId(skuId);
            stock.setNum(item.getCount());
            //查询这个商品在哪里有库存
            List<Long> wareid = wareSkuDao.listWareIdHasSkuStock(skuId);
            stock.setWareId(wareid);
            return stock;
        }).collect(Collectors.toList());

        //2、锁库存
        boolean allLocke = true;
        for (SkuWareHasStock hasStock : collect) {
            boolean skuStocked = false;
            Long skuId = hasStock.getSkuId();
            List<Long> wareIds = hasStock.getWareId();
            if (wareIds == null || wareIds.size() == 0) {
                throw new NoStockException(skuId);
            }
            //1、如果每一个商品都锁定成功，将当前商品锁定了几件的工作单记录发给MQ
            //2、锁定失败，前面保存的工作单信息回滚了,发送出的消息，即使要解锁记录，由于去数据库查不到
            //id,也就不用去再解锁库存
            for (Long wareId : wareIds) {
                //成功返回1，失败返回0
                long count = wareSkuDao.lockSkuStock(skuId, wareId, hasStock.num);
                if (count == 1) {
                    //锁成功
                    skuStocked = true;
                    WareOrderTaskDetailEntity taskDetailEntity = new WareOrderTaskDetailEntity(
                            null,
                            skuId,
                            "",
                            hasStock.getNum(),
                            taskEntity.getId(),
                            wareId,
                            1);
                    orderTaskDetailService.save(taskDetailEntity);
                    //通知MQ存锁定成功
                    StockLockedTo lockedTo = new StockLockedTo();
                    lockedTo.setId(taskEntity.getId());
                    StockDetailTo stockDetailTo = new StockDetailTo();
                    BeanUtils.copyProperties(taskDetailEntity, stockDetailTo);
                    lockedTo.setDetailTo(stockDetailTo);
                    //只发id不行，防止回滚以后找不到数据
                    rabbitTemplate.convertAndSend("stock-event-exchange",
                            "stock.locked", lockedTo);
                    break;
                } else {
                    //锁失败
                }
            }
            if (skuStocked == false) {
                throw new NoStockException(skuId);
            }
        }

        //肯定全部锁定成功

        return true;
    }

    private void unlockStockTemp(Long skuId, Long wareId, Integer num, Long taskDetailId) {
        //库存解锁
        wareSkuDao.unlockStock(skuId, wareId, num);
        //更新库存工作单的状态
        WareOrderTaskDetailEntity entity = new WareOrderTaskDetailEntity();
        entity.setId(taskDetailId);
        entity.setLockStatus(2);//变为己解锁
        orderTaskDetailService.updateById(entity);
    }

    @Override
    public void unlockStock(StockLockedTo to) {
        StockDetailTo detail = to.getDetailTo();
        Long skuId = detail.getSkuId();
        Long detailId = detail.getId();
        //解锁
        //1、查询数据库关于这个订单的锁定库存信息
        //   有：说明库存锁定成功了，
        //      解锁：订单情况
        //            1、没有这个订单，必须解锁
        //            2、有这个订单，不是解锁库存
        //                订单状态：己取消：解锁库存
        //                          没取消：不能解锁
        //   没有:库存锁定失败了，库存回滚了  这种情况无需解锁

        WareOrderTaskDetailEntity byId = orderTaskDetailService.getById(detailId);
        if (byId != null) {
            //解锁
            Long id = to.getId();//库存工作单的id
            WareOrderTaskEntity taskEntity = orderTaskService.getById(id);
            String orderSn = taskEntity.getOrderSn();//根据订单号查询订单的状态
            R r = orderFeignService.getOrderStatus(orderSn);
            if (r.getCode() == 0) {
                //订单数据返回成功
                OrderVo data = r.getData(new TypeReference<OrderVo>() {
                });
                if (data == null || data.getStatus() == 4) {
                    //订单不存
                    //订单被取消了,才能解锁库存
                    if(byId.getLockStatus() == 1){
                        //当前库存工作单详情，状态1己锁定，但是未解锁才可以解锁
                        unlockStockTemp(detail.getSkuId(), detail.getWareId(), detail.getSkuNum(), detailId);
                    }

                }
            } else {
                //消息拒绝以后重新放回队列，让别人继续消费解锁
                throw new RuntimeException("远程服务失败");
            }
        } else {
            //无需解锁
        }

    }

    //防止订单服务卡顿，导致订单状态消息一直改不了，库存消息优先到期，查订单状态为新建状态，什么都不做就走了
    //导致卡顿的订单，永远不能解锁库存
    @Transactional
    @Override
    public void unlockStock(OrderTo orderTo) {
        String orderSn = orderTo.getOrderSn();
        //查一下最新库存的状态，防止重复解锁库存
        WareOrderTaskEntity task = orderTaskService.getOrderTaskByOrderSn(orderSn);
        //按照库存工作找到所有没有解锁的库存，进行解锁
        Long id = task.getId();
        List<WareOrderTaskDetailEntity> entities = orderTaskDetailService.list(new QueryWrapper<WareOrderTaskDetailEntity>().eq("task_id", id)
                .eq("lock_status", 1));
        //Long skuId, Long wareId, Integer num, Long taskDetailId
        for (WareOrderTaskDetailEntity entity : entities) {
            unlockStockTemp(entity.getSkuId(),entity.getWareId(),entity.getSkuNum(),entity.getId());
        }

    }

    @Data
    class SkuWareHasStock {
        private Long skuId;
        private Integer num;
        private List<Long> wareId;
    }

}